Physics does not have a “yes” or “no” answer to this question, for at least two reasons. First, we don’t have a complete picture of physics yet. (That is not an invitation to declare that scientists actually have no idea how stuff works and publish a book on that fact yourself.) Even if we did work with one specific theory of physics, like relativity, we still wouldn’t have an answer. That’s because, Second, you have to apply an interpretation to what you have. Physics does not tell us things like “Time exists” or “Time doesn’t exist.” It says things like “G[sub]ab[/sub] = 8pi T[sub]ab[/sub]”. In order to go from that to some metaphysical-sounding sentence on the existence of time, you have to apply some pretty hefty interpretations, and often it’s not very clear which interpretation is right. So you wind up with things like Schrödinger’s cat, where you don’t know what the equation is telling you.